1. Make the mango sauce: Preheat a grill or grill pan to high. Grill tomatoes on all sides until charred.

2. In a medium saucepan, combine tomatoes with remaining sauce ingredients. Bring to simmer over low heat and cook until thickened, about 15 minutes. Transfer to a blender and puree until smooth.

3. Make the mahi-mahi: Coat fish with oil and season with salt and pepper. Oil grill grids or pan, and grill fish on one side for 3 minutes, or until lightly browned. Turn, baste with mango sauce, and cook for 2 to 3 minutes, or until opaque throughout. Brush fillets with remaining sauce and serve.

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